From the documentation here is what my body looks like for the request.

I'm trying to create one parent (SEO__CSEO_Survey__c) and then one child (SEO__CSEO_Survey_Question__c) in a master-detail relationship.

        "records": [{

The error

[ { "message": "No such column 'SEO__CSEO_Survey_Question__c' on sobject of type SEO__CSEO_Survey__c", "errorCode": "INVALID_FIELD" } ]

What I don't understand from the docs is on line 9 of the example code. The example uses "Contacts", as if that was a field on Account, which it is not, correct?

Instead of naming my key SEO__CSEO_Survey_Question__c, what should it be?

Update: Solved thanks to Adrian. Here is a screenshot of my relationship if someone has a problem understanding the solution.

enter image description here


If you want to get the child relationship name, you can use this script:

for (ChildRelationship relation : SObjectType.SEO__CSEO_Survey__c.getChildRelationships())
    if (relation.getChildSObject() == SEO__CSEO_Survey_Question__c.sObjectType)

The relationship name should be printed exactly as you need to specify it. Usually it's plural, and always ends in __r for custom relationships. So the expected value would be: SEO__CSEO_Survey_Questions__r.

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